Surprise flash mob featuring the Black Eyed Peas (2009)

Surprise flash mob featuring the Black Eyed Peas (2009)

Terrence Antonio James / Chicago Tribune

Oprah invited the Black Eyed Peas to perform at her Season 24 kickoff party on Michigan Avenue in Chicago, but they had more than just a song and dance in store. When BEP started to sing "I've Got a Feeling," the crowd of about 20,000 transformed into a flash mob, and the scene stunned the queen of surprises. She cried out, "That is the coolest thing ever!" as the tune ended.

Oprah invited the Black Eyed Peas to perform at her Season 24 kickoff party on Michigan Avenue in Chicago, but they had more than just a song and dance in store. When BEP started to sing "I've Got a Feeling," the crowd of about 20,000 transformed into a flash mob, and the scene stunned the queen of surprises. She cried out, "That is the coolest thing ever!" as the tune ended. (Terrence Antonio James / Chicago Tribune)

Oprah invited the Black Eyed Peas to perform at her Season 24 kickoff party on Michigan Avenue in Chicago, but they had more than just a song and dance in store. When BEP started to sing "I've Got a Feeling," the crowd of about 20,000 transformed into a flash mob, and the scene stunned the queen of surprises. She cried out, "That is the coolest thing ever!" as the tune ended.